Hello! I have some signed SK books that I need to get a certificate of authenticity for and I was thinking you might have a place that you would recommend to have that done. Any help would be SOOOOO appreciated!

Many are optioned -- many are not filmed! In King's case, the best example is The Talisman, which was optioned before it was published 30 years ago, by Steven Spielberg no less, and still nothing. You'd need a crystal ball to predict whether anyone will get the funding they need to make a film, assuming they're still interested in the project. Sometimes people get frustrated and move on.